It compares the M2tech Evo & the Halide Bridge to the JKHiface. Remember this is the MK1 version that is being reviewed so the battery comments don't apply & are somewhat incorrect for the MK1 anyway! Extract from conclusion:

John Kenny Mk1 boxed hiFace

Pros:Best sound of the three provided inline RF attenuators are used to get the level down to standards.Lowest initial cost.